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Further Workplace Health and Safety bosses will be grilled at the inquest into the Dreamworld disaster today, after a leading inspector admitted he had "no confidence" in the emergency procedures in place on the Thunder River Rapids ride.

Fukushima health fears linger one year on

Shoko Nagami fears for the health of her siblins, who continue to live with invisible radiation in her home prefecture of Fukushima.

A year on from the earthquake and tsunami that killed 19,000 people in Japan, protesters gathered in Melbourne's central business district on Sunday to urge the end of Australia's uranium export industry, worth about $1.1 billion annually.

Ms Nagami, 62, left Fukushima when she was 20 years old but has two brothers and a sister still living in the prefecture.

Her elder brother lives outside the exclusion zone, about 55km from the Fukushima Daiichi nuclear reactor.

His home is still standing, although roof tiles fell and one wall of it was destroyed in the earthquake.

Ms Nagami said her family cannot afford to leave Fukushima and has received no government compensation.

"I'm worried about their health," she told AAP.

"They have a radiation problem."

On a visit last October, Ms Nagami saw many rotten apples and persimmons that had not been harvested because of contamination.

She said it was a reminder of the invisible radiation in the area.

"One problem with radiation is no smell, no colour, nothing, so it's just the same as before," she said.

"But when we check ... with the radiation measure, then we know, but otherwise we can't realise (because it's) invisible.

"That's the most frustration."

Japan is still operating two of its 54 reactors.

Japanese for Peace spokeswoman Kazuyo Preston said the Australian government should stop exporting uranium.

"Australia is the beginning of the nuclear fuel chain cycle," she told AAP.

"The uranium that was used to fuel Fukushima reactors came from Australia.

"If there is any way we can stop uranium mining in Australia then there will be no Fukushima."

The ALP national conference in December voted to allow Australian uranium exports to India.

Premier Barry O'Farrell will introduce legislation into parliament so NSW can join the uranium-mining states of Western Australia and South Australia, and the Northern Territory.